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Kung Fu Maintenance demonstrates how to charge an air conditioner through the suction side only by feel.
In this particular episode of Kung Fu Maintenance classes KFM shows the different treatment needed charge an air conditioner system that is low on freon. To give proper split temperature through the return and transfer heat through the refrigerant from inside to outside the dwelling. No degree is needed to watch these videos and the emphasis is on safety to prevent the need for any accident attorney or any insurance claim. You must be EPA certified to hook up gauges or change refrigerant charges for most types of refrigerant.
Proper charging of AC systems and proper maintenance reduce electricity usage and increase equipment longevity through the best use of refrigerant gas to transfer heat where desired.
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OK, we’ve got an AC just barely cool in here. Kind of low on freon. Ompressor’s pretty hot to the touch. Unit’s still running.
It’s going to be charging up through the low side. You’ve got a tiny leak at the evaporator. So we’re going to be using a micro additive. Got our gauges calibrated.
We’ve got a couple of things we can make better. Got our new fan capacitor. We could secure that up. Make that better.
Make sure all our gauges are turned off here. And I’ll remove the cap on the low side. It’s blazing hot today. Probably 109 degrees out here today.
Just going to try to get this going and get off the roof. It’s pretty humid today too, so not the easiest day to be up here. Looks like the Schrader valve cap needs to come out with the cap. It’s kind of stuck on the end there.
Make sure we recover that. There’s our o-ring. Put that back in the cap for later use.
Now we’re going to hook up our quick connect fitting. This is a low loss fitting. Prevent frostbite. Want to wear gloves. Wear safety glasses.
Now we can check our reading up top. See what our pressures are. So we’re showing at about 30, which means we’re just a little bit low. And purge the line.
Make sure all the valves are tight here. Pick up our refrigerant can at the end. Got my can of refrigerant up here. Going to set it up top and run the middle line.
Charging port hooks up to the tank of refrigerant. OK. Open the line.
And back down here, we’re going to go ahead and purge. Purge the line. Purge both sides. Now we’re ready to charge.
Now, because the compressor is really hot, I’m going to dump some cold water. All I have today is cold water. And I actually prefer to use a little bit of ice to cool it down, speed up the charge. But I’ll be using the cold water instead.
So this has been in the fridge for a while. That will help speed the charge up. Going to monitor the line. It’s already starting to feel a bit colder. I’m monitoring it with my wrist here.
What we wanted is for this line here that goes down to the evaporator. And the temperature at the evaporator will start to backtrack up this line to the compressor. This is the suction line. It’s why we’re sucking in the refrigerant there from our tank up top here.
But what I have is capillary tube system at my evaporator coil. And the capillary tube system is a metering device that only lets so much refrigerant through at a time. Now the deal is, the temperature of the evaporator coil needs to be about 40 degrees, which is above freezing. You know, water freezes at 32 degrees.